Hi Here http://marc.info/?l=openssl-users&m=124386218929227 It states that
"...This is why it is very important to understand that any possible forward progress on any port (and a write operation that returns WANT_READ may have made forward progress!) requires you to retry all pending operations on all ports...." So am I correct in understanding that an SSL_read() that returned WANT_READ may have made forward progress (even if it did not return any data)? I have an event driven single threaded app that has 3 non blocking ssl sockets. When each socket completes its connection, I have the sockets read until I get a WANT_READ. My understanding is that a WANT_READ means I may now invoke select() and wait until the socket is ready for reading again. When select() returns, a loop goes through the 3 sockets calling ssl_read() on each of them. Say a read on Socket 1 returned WANT_READ and no data. Is it possible that Socket 2 may return WANT_READ, returns some data, and has now made some progress such that a read on socket 1 may now return data? But as the loop has already done the read for socket 1, it will not happen. As the loop has run through the 3 sockets, it waits there and hangs. Could this situation happen? If this is the case, how do I tell no more progress can be made on all 3 sockets? For example, say the loop runs through; -socket 1 returns WANT_READ. -socket 2 returns some data, then WANT_READ (and makes progress such that socket 1 can now return data) -socket 3 returns WANT_READ. But based on the quote above (where any forward progress requires retrying all pending operations), I should retry all sockets again; so the second run through the loop; -socket 1 now returns data, then WANT_READ -socket 2 returns WANT_READ -socket 3 now returns data (because the read on socket 1 made enough progress for socket 3 to return data), then WANT_READ. But what if the last read made progress such that socket 2 now returns data again? So my question is (if my understanding is correct), how do I tell in this instance how many times I'd need to run through the loop? Thanks ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
